package com.sky.service.user.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.user.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service("userUserService")
@Slf4j
public class UserServiceImpl implements UserService {

    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    private final WeChatProperties weChatProperties;
    private final UserMapper userMapper;

    @Autowired
    public UserServiceImpl(WeChatProperties weChatProperties, UserMapper userMapper) {
        this.weChatProperties = weChatProperties;
        this.userMapper = userMapper;
    }

    /**
     * 微信登录
     * @return User实体类
     */
    @Override
    public User wechatLogin(UserLoginDTO userLoginDTO) {
        log.info("执行 微信登录 业务:{}",userLoginDTO);
        //获取openId
        String openId = getOpenId(userLoginDTO.getCode());

        if(openId == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //判断用户是否为新用户
        User user = userMapper.getUserByOpenId(openId);
        if(user == null) {//如果是新用户， 则完成注册

            user = User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();
            log.info("注册新用户:{}",user);
            userMapper.insertUser(user);
        }

        //返回用户对象
        return user;
    }

    /**
     * 获取用户的OpenId
     * @param code js_code
     * @return OpenId
     */
    private String getOpenId(String code){
        //调用微信接口服务，获取当前微信用户的openid
        Map<String,String> map = new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant_type","authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN,map);
        JSONObject jsonObject = JSONObject.parseObject(json);
        return jsonObject.getString("openid");
    }
}
